Silicon-cored pipe and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a silicon-cored pipe and a preparation method thereof. According to the invention, a high-molecularanti-ultraviolet auxiliary agent is used as an auxiliary agent and added into a medium-density polyethylene matrix to prepare the silicon-cored pipe, has good compatibility with the polyethylene matrix, can overcome the defect that an inorganic flame retardant is difficult to disperse, is uniformly distributed in the pipe, and gives full play to the flame retardant property of the pipe; and the prepared silicon-cored pipe is of a double-layer pipe structure, and the double-layer structure endows the silicon-cored pipe with high strength and excellent flame retardance, and the silicon-cored pipe has excellent friction resistance and environmental cracking resistance and has extremely high use safety performance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a silicon core tube and a preparation method thereof. [0002] technical background [0003] The silicon core tube was invented by the American AT&T company in the 1980s. The silicon core tube is a kind of tube with a solid lubricating layer formed by extruding silicone plastic into a high-density polyethylene tube synchronously. The lubricating layer can reduce the friction resistance of light and cable repeatedly drawn in the pipe. Compared with the traditional cement, PVC sub-pipe and other protective pipes, the silicon core pipe has the advantages of easy installation and laying, good smoothness, stable quality, Long service life and other characteristics, so it is often used as a protective pipe for optical cables or cables. When the silicon core tube is used as a cable duct, it needs to have flame retardant properties, otherwise, when the internal cabl...

AI Technical Summary

Problems solved by technology

High-density polyethylene has excellent low temperature resistance, high impact resistance, wear resistance, and good electrical properties, but poor environmental stress cracking resistance and short service life; low-density polyethylene has good flexibility and impact resistance , but the strength is low, the heat distortion temperature is low, and the heat resistance is poor, which will cause the pipe to deform for a long time, thereby affecting its service life. Therefore, the above two polyethylenes have great defects as silicon core pipe materials

[0005] In order to make up for the above defects, the commonly used method is to mix low-density polyethylene and high-density polyethylene. In order to increase the strength, a large amount of high-density polyethylene needs to be added, and high-density polyethylene is a material that is extremely sensitive to environmental stress cracking. , the greater the content of high-density polyethylene is added, the pipe is prone to stress cracking and the life is shorter; due to the limited space of tunnels and pipe galleries, a large number of communication lines are very close to high-voltage cable lines, high-voltage cables generate heat for a long time, and a large amount of heat will be generated around them. heat, while the heat distortion temperature of polyethylene is not high, its heat resistance is poor, and it will cause the pipe to deform for a long time, thereby affecting its service life; in addition, the silicon core tube needs to have flame retardancy when used as a cable duct Flame retardant properties, often adding flame retardants, uneven distribution of flame retardants will reduce the mechanical properties of silicon core tubes

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